Waterproof insulated electric conductor



(No Model.)

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D. MACFARLAN. WATERPROUP INSULATED ELECTRIC-CONDUCTOR.

Patented Aug. 7, 1894.

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UNrTED STATES PATENT OFFICE.

`DUNCAN `MACFARLAN, OF PHILADELPHIA, PENNSYLVANIA.

WATERPROOF INSULATED ELECTRIC CONDUCTOR.

SPECIFICATION formingpart of Letters Patent No. 524,066,5dated August 7,1894. Application flied May 17, 1894:- Sen'al No. 5111534. (No model.)

To a/ZZ whom t may concern.-

Be it known that I, DUNCAN MACEAELAN, a citizen of the United States,residing at the city of Philadelphia, in the county of Philadelphia andState of Pennsylvania, have invented certain new and useful Improvementsin Fire and Water Proof Insulated Electric Conductors, of which thefollowing is a speciiication.

My invention has relation to insulated electric conductors; and in suchconnection it relates more particularly to the construction andarrangement of an insulated conductor which is both iire and Water prooffor electric light, telegraph and other purposes.

The principal object of my present invention is to provide a simple andeffective iire and water proof electric insulated conductor for electriclighting, telephone, telegraph and other uses. l

My invention stated in general consists of an electric conductorconstructed and arranged in substantially the manner hereinafterdescribed and claimed.

The nature and scope of myinvention will be more fully understood fromthe following description taken in connection with the accompanyingdrawing forming part hereof, illustrating in elevation an insulated fireand water proof electric conductor, embodying the features of myinvention.

Referring to the drawing A, is the conductor of copper or other suitablemetal of good conductivity for the passage of a current through thesame.

B, is a structure comprising a cord or thread of asbestus or mineralwool wound around the conductor A, after the same has beenthoroughly-saturated with asphaltum, coal tar or the like C.

D, is rubber cloth or tarred canvas sheets or strips wound around thecorded surface of the conductor in spiral or similar form and forming anouter covering therefor.

The asbestus or mineral wool in the form of a cord or thread saturatedwith asphaltm, coal tar or the like when applied to the conductorconstitutes not only a perfect insulator but also a fire-proof coveringtherefor and the surrounding covering of sheets or strips of rubbercloth or tarred canvas renders the conductor water-proof, whereby isprovided a conductor which as hereinbefore described is especiallyadapted for electric light, telephone and telegraph purposes, but itshould be understood that it can be employed for other uses.

Having thus described the nature and objects of my invention, what Iclaim as new, and desire to secure by Letters Patent, is

l. A water and fire proof insulated electric conductor having a threador cord of tire-proof material saturated with a liquid insulatingsubstance wound around the same and a water-proof sheet or stripsurrounding 'said conductor, substantially as described.

2. A water and fire proof insulated electric conductor having a cord orthread of lire-proof material saturated with an insulating substancewound around the same and with an outer rubber cloth covering,substantially as described.

In testimony whereof I have hereunto set mysignature in the presence oftwo subscrib-f ing witnesses.

DUN CAN MACFARLAN.

lWitnesses:

RICHARD C. MAXWELL, LoUIs WINTEEEEEGEE.

